Re: [radext] Alissa Cooper's Discuss on draft-ietf-radext-ip-port-radius-ext-11: (with DISCUSS and COMMENT)
kathleen.moriarty.ietf@gmail.com Tue, 16 August 2016 21:16 UTC
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From: kathleen.moriarty.ietf@gmail.com
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References: <147137412687.22998.17081075232946825763.idtracker@ietfa.amsl.com> <CAHbuEH7+Gw=zDiN66Aydmie2M4dXcVqjLKWHixR7Qe6ECfN9Hg@mail.gmail.com> <D0152C61-D391-482B-BF1E-45180F89DA41@cooperw.in>
To: Alissa Cooper <alissa@cooperw.in>
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Cc: radext-chairs@ietf.org, draft-ietf-radext-ip-port-radius-ext@ietf.org, "radext@ietf.org" <radext@ietf.org>, IESG <iesg@ietf.org>, "<lionel.morand@orange.com>" <lionel.morand@orange.com>
Subject: Re: [radext] Alissa Cooper's Discuss on draft-ietf-radext-ip-port-radius-ext-11: (with DISCUSS and COMMENT)
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Sent from my iPhone > On Aug 16, 2016, at 4:54 PM, Alissa Cooper <alissa@cooperw.in> wrote: > > >> On Aug 16, 2016, at 4:41 PM, Kathleen Moriarty <kathleen.moriarty.ietf@gmail.com> wrote: >> >> Alissa, >> >> Thanks for your detailed review, this is helpful. Hopefully we will >> be able to resolve this with the editors and shepherd before Thursday. >> I have one question in line that may help with the resolution for at >> least #1 & #6. >> >>> On Tue, Aug 16, 2016 at 3:02 PM, Alissa Cooper <alissa@cooperw.in> wrote: >>> Alissa Cooper has entered the following ballot position for >>> draft-ietf-radext-ip-port-radius-ext-11: Discuss >>> >>> When responding, please keep the subject line intact and reply to all >>> email addresses included in the To and CC lines. (Feel free to cut this >>> introductory paragraph, however.) >>> >>> >>> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html >>> for more information about IESG DISCUSS and COMMENT positions. >>> >>> >>> The document, along with other ballot positions, can be found here: >>> https://datatracker.ietf.org/doc/draft-ietf-radext-ip-port-radius-ext/ >>> >>> >>> >>> ---------------------------------------------------------------------- >>> DISCUSS: >>> ---------------------------------------------------------------------- >>> >>> (1) I find the absence of any definition of error handling behavior in >>> this document to be a problem. I realize that the attributes specified in >>> this document are meant to be transmitted between components that are all >>> operated by the same administrative entity, but implementors can still >>> make mistakes, and for those cases it seems like error handling should be >>> defined. For example: >>> >>> - What happens if the AAA server sends an IP-Port-Limit-Info attribute >>> with a larger limit than the CGN is able to allocate to that particular >>> user? What is the CGN supposed to do and how is that communicated back to >>> the AAA server? >>> >>> - What happens if the CGN sends an IP-Port-Range attribute that >>> encompasses a larger range than a previously sent IP-Port-Limit-Info? >>> What is the AAA server supposed to do? >>> >>> - What happens if the AAA server sends an IP-Port-Forwarding-Map >>> attribute to map a port that is not within the requesting host's >>> allocated range? Is the CGN expected to change the mapping and send a CoA >>> with a different IP-Port-Forwarding-Map, or communicate some sort of >>> error, or something else? >>> >>> There are surely other error cases. I think it's worth going through the >>> uses of each attribute and specifying all the error handling behavior. >>> This seems especially important since part of the motivation for these >>> attributes is for identification and the consequences of erroneous >>> identification could be severe for the user. Discussion of those >>> consequences is also missing from Section 6. >> >> As an alternative, I usually approach this type of problem as defining >> what is acceptable and making everything else less acceptable. White >> lists are much easier to maintain and eliminate the possibility of >> missing something. If you and the WG agree, could we go forward with >> that approach instead of defining all possible problems, just limiting >> what is acceptable and making everything else an error? > > I think it’s fine to say “the only correct behavior is X” but you still need to say what implementations are expected to do when not-X happens. And X will have different values for the different usages of each of these attributes. > Agreed, thanks. Kathleen > Alissa > >> This approach >> applies to a few of your other discuss points as well, namely #2, #5, >> and to some degree #3. >> >>> >>> (2) Section 3.1.2 says: >>> >>> "For port allocation, both IP-Port-Range-Start TLV and IP- >>> Port-Range-End TLV must be included; for port deallocation, the >>> inclusion of these two TLVs is optional and if not included, it >>> implies that all ports that are previously allocated are now >>> deallocated." >>> >>> How does an AAA server distinguish between port allocation and >>> deallocation requests if a deallocation request includes a range start >>> and range end? Is the server supposed to assume that whatever range is >>> specified by the most recently received IP-Port-Range attribute >>> represents the only range of allocated ports for the host? What is the >>> meaning of sending an IP-Port-Range request with only a start value or an >>> end value but not both (as seems to be allowable by the above)? >>> >>> (3) The specification of IP-Port-Local-Id seems to allow for unnecessary >>> exposure of potentially sensitive information. There is no explanation >>> given for why the combination of the other identifiers included in >>> IP-Port-Range and IP-Port-Forwarding attributes is insufficient to >>> identify the host in DS-Extra-Lite and Lightweight 4over6 cases. As >>> defined, it sounds like implementations could put basically any user, >>> device, or interface identifier in there. If this TLV is actually >>> necessary to communicate what these attributes are trying to accomplish, >>> the justification for it should be provided and the limitations on when >>> this field may be used and what kind of identifiers can appear here >>> should be stated. >>> >>> (4) The shepherd write-up discusses two different approaches to defining >>> the sub-TLV types and then says: "Both approaches were considered as >>> valid and the WG has decided to let IANA decide what the approach is >>> preferred when allocating the TLV-Type for the sub-TLVs defined in this >>> document." This is not appropriate. The document needs to explicitly >>> define how the types should be allocated and should not leave the >>> decision to IANA. I see that IANA has already noted that Section 7.3 is >>> ambiguous about this; the WG needs to make a choice. >> >> Thank you, and yes, the WG needs to make a decision. >> >> Kathleen >> >>> >>> (5) Section 6 seems to be missing a discussion of the consequences of >>> communicating erroneous port range and port mapping information. Since >>> part of the motivation for these attributes is identification of the >>> host, this needs to be discussed. >>> >>> >>> ---------------------------------------------------------------------- >>> COMMENT: >>> ---------------------------------------------------------------------- >>> >>> (1) What does it mean for an IP-Port-Range attribute to have IP-Port-Type >>> 1 or 2? Can numbers in the whole range be used for any of the port or >>> identifier types? Or is the range expected to be split up somehow among >>> the multiple types? I think this needs to be explained. >>> >>> (2) In 4.1.4, how does the ISP know that Joe is traveling? >> >> >> >> -- >> >> Best regards, >> Kathleen >
- Re: [radext] Alissa Cooper's Discuss on draft-iet… kathleen.moriarty.ietf
- Re: [radext] Alissa Cooper's Discuss on draft-iet… kathleen.moriarty.ietf
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Alissa Cooper
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Kathleen Moriarty
- [radext] Alissa Cooper's Discuss on draft-ietf-ra… Alissa Cooper
- Re: [radext] Alissa Cooper's Discuss on draft-iet… lionel.morand
- Re: [radext] Alissa Cooper's Discuss on draft-iet… lionel.morand
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Alan DeKok
- [radext] RE : Re: Alissa Cooper's Discuss on draf… lionel.morand
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Alan DeKok
- Re: [radext] Alissa Cooper's Discuss on draft-iet… David B. Nelson
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Dean cheng
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Alissa Cooper
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Alissa Cooper
- Re: [radext] Alissa Cooper's Discuss on draft-iet… lionel.morand
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Alan DeKok
- Re: [radext] Alissa Cooper's Discuss on draft-iet… lionel.morand
- Re: [radext] Alissa Cooper's Discuss on draft-iet… lionel.morand
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Alan DeKok
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Kathleen Moriarty
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Alan DeKok
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Kathleen Moriarty
- Re: [radext] Alissa Cooper's Discuss on draft-iet… Kathleen Moriarty